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- W3036690748 abstract "We discuss plasmons of biased twisted bilayer graphene when the Fermi level lies inside the gap. The collective excitations are a network of chiral edge plasmons (CEP) entirely composed of excitations in the topological electronic edge states that appear at the AB-BA interfaces. The CEP form a hexagonal network with a unique energy scale ${ensuremath{epsilon}}_{p}=({e}^{2})/({ensuremath{epsilon}}_{0}ensuremath{epsilon}{t}_{0})$ with ${t}_{0}$ the moir'e lattice constant and $ensuremath{epsilon}$ the dielectric constant. From the dielectric matrix we obtain the plasmon spectra that has two main characteristics: (i) a diverging density of states at zero energy, and (ii) the presence of a plasmonic Dirac cone at $ensuremath{hbar}ensuremath{omega}ensuremath{sim}{ensuremath{epsilon}}_{p}/2$ with sound velocity ${v}_{D}=0.0075c$, which is formed by zigzag and armchair current oscillations. A network model reveals that the antisymmetry of the plasmon bands implies that CEP scatter at the hexagon vertices maximally in the deflected chiral outgoing directions, with a current ratio of $4/9$ into each of the deflected directions and $1/9$ into the forward one. We show that scanning near-field microscopy should be able to observe the predicted plasmonic Dirac cone and its broken symmetry phases." @default.
- W3036690748 created "2020-06-25" @default.
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- W3036690748 date "2020-12-18" @default.
- W3036690748 modified "2023-10-15" @default.
- W3036690748 title "Plasmonic Dirac Cone in Twisted Bilayer Graphene" @default.
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- W3036690748 doi "https://doi.org/10.1103/physrevlett.125.256804" @default.
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